Count yourself lucky. I have tennis elbow in right arm, which is now just subsiding after about 15 months. Course of recovery can be up to two years and I put myself in that category as I can still feel issues. It may never go away.
Ive watched tons of videos, performed "at home" PT, got referral from doc for real PT but because of Covid was not able/unwilling to mess with exposure/time/expense.
From my reading, PT for tennis elbow is not much better than placebo. Some people are long haulers and need significant time. Ironically, the exersize which helps me most is reverse finger extension (put fist in sock and open hand) which is not common PT for TE.
It was not caused by playing, but by guitar maintenance, a period of two weeks where I decided to level, crown and polish all my guitar necks. I probably put in 40+ hours of back/forth filing and polishing moitions in a very short period of time. I haven't played guitar since then because unsure if picking motion will exacerbate problem. Also afraid it will get worse as spring is upon us, yard work, washing cars, etc, had made it worse last summer. Its been a serious problem for me.
My left arm also screwed up by a completely torn bicep about five years ago. Had to go through surgery, change my playing position, etc, which probably altered my RH picking enough to cause the TE. It certainly limited range of motion just enough that to vibrato I need to sit in classical.
Both of my arms are ****ed. I haven't picked up guitar in 15 months. I am patient and believe I will play again.
I just wanted to point out that your recovery from TE, from everything I read about course of recovery and the role of PT, is probably just luck. PT has very low success rate for healing TE.